/*
 *    StringUtils.java
 *    Copyright (C) 2007 University of Waikato, Hamilton, New Zealand
 *    @author Richard Kirkby (rkirkby@cs.waikato.ac.nz)
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
package moa.core;

import java.text.DecimalFormat;

public class StringUtils {

	public static final String newline = System.getProperty("line.separator");

	public static String doubleToString(double value, int fractionDigits) {
		return doubleToString(value, 0, fractionDigits);
	}

	public static String doubleToString(double value, int minFractionDigits,
			int maxFractionDigits) {
		DecimalFormat numberFormat = new DecimalFormat();
		numberFormat.setMinimumFractionDigits(minFractionDigits);
		numberFormat.setMaximumFractionDigits(maxFractionDigits);
		return numberFormat.format(value);
	}

	public static void appendNewline(StringBuilder out) {
		out.append(newline);
	}

	public static void appendIndent(StringBuilder out, int indent) {
		for (int i = 0; i < indent; i++) {
			out.append(' ');
		}
	}

	public static void appendIndented(StringBuilder out, int indent, String s) {
		appendIndent(out, indent);
		out.append(s);
	}

	public static void appendNewlineIndented(StringBuilder out, int indent,
			String s) {
		appendNewline(out);
		appendIndented(out, indent, s);
	}

	public static String secondsToDHMSString(double seconds) {
		if (seconds < 60) {
			return doubleToString(seconds, 2, 2) + 's';
		}
		long secs = (int) (seconds);
		long mins = secs / 60;
		long hours = mins / 60;
		long days = hours / 24;
		secs %= 60;
		mins %= 60;
		hours %= 24;
		StringBuilder result = new StringBuilder();
		if (days > 0) {
			result.append(days);
			result.append('d');
		}
		if ((hours > 0) || (days > 0)) {
			result.append(hours);
			result.append('h');
		}
		if ((hours > 0) || (days > 0) || (mins > 0)) {
			result.append(mins);
			result.append('m');
		}
		result.append(secs);
		result.append('s');
		return result.toString();
	}
}
